Drop support for IE 11 and Samsung 4

[steverep]

Proposed change

The title is kind of a farce because we don't actually currently support IE 11 or Samsung 4 because the web components polyfills are not really loaded properly. In any case, this change adjusts the legacy build to stop transpiling and adding core-js polyfills for them.

These 2 browsers are outside our last 7 years support window, and are only included because of the threshold on usage. But since they are considered dead and won't load the frontend anyway, removing them makes sense. It makes extra sense because the minimum versions of the evergreens have recently passed some critical support milestones, so this drops some of the bigger Babel transforms like async functions, classes, template literals, destructuring, and more, and also knocks off about 120 polyfills from Core JS.

Note the minimums also recently passed the milestones for Brotli support, so I can trade Zopfli for Brotli in this PR as well, but please merge #23233 first.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (thank you!)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Example configuration

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue or discussion:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

[steverep]

750 less modules to bundle,and somehow it ends up with 11 more chunks and a slightly bigger size 😞